2 synonym groups for Gestein

erosion, degradation, decomposition, disintegration, breakdown, wear, attrition, corrosion, decay, denudation, deterioration, abrasion, crumbling, fragmentation, wearing away, wasting, weathering away, disaggregation, exfoliation, spalling, spallation, fretting, scouring, scuffing, grinding down, wearing down, wearing out, wearing off [x]

foundation, base, bottom, groundwork, substratum, underpinning, basis, root, support, footing [x]